One of my leads has a name that ends in s. It's too late to change it and I wouldn't want to anyway, but showing possession is giving me a headache. I've looked it up and the rule doesn't seem clear to me. Some say you should use the phonetic spelling, Giles's. I strongly prefer it with only the apostrophe, no s.
Giles' arm
Giles's arm
Which is correct?
Giles' arm
Giles's arm
Which is correct?